I can help with a couple of these. Yes it works on Garalon if you center it on the body it will hit the legs. New legs do not spawn with it so it's only useful on the pull. SB:CoE does not work with MF since it is not an aoe spell. In terms of Elegon you can hit both the orbs and the sparks. Sparks you would want to center it on a spark as you stack them for aoe. Yes it would work on Feng and Windlord. Basically any fight where things get within 15yds of each other you can use it.

I can help with a couple of these. Yes it works on Garalon if you center it on the body it will hit the legs. New legs do not spawn with it so it's only useful on the pull. SB:CoE does not work with MF since it is not an aoe spell. In terms of Elegon you can hit both the orbs and the sparks. Sparks you would want to center it on a spark as you stack them for aoe. Yes it would work on Feng and Windlord. Basically any fight where things get within 15yds of each other you can use it.

Thanks for the answer, also to my other post.

Why would it not work on newly spawned legs? I assumed its a Aura, which means on Garalon, so I assumed it would apply to new legs aswell?

It is not an aura it is a one time check. There was an old affliction talent that worked like that where anything that got close enought to your CoE target got it as well. When you SB:CoE it doesn't put a special version of CoE on the target. It just puts the normal CoE up and then checks for any targets within 15yrds and puts a regular CoE on those as well. On Garalon the new legs are new mobs and were not there when you originally cast SB:CoE so they do not get it.

Nope. It's an aura and will always effect new targets in its range. Also currently it IS effected by MF, however in 5.1 it has been nerfed. All of this is fairly easy to test in game, and I re-tested it before coming to post.

Edit: I'm dumb and don't read. SB: CoE is a one time thing, Aura of the Elements from Demo is not. If you are wanting an easy to use AoE elements Demo is the way to go.